JPH0220501Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a so-called floating type vehicle disc brake.

[Prior Art] In this type of disc brake, a pair of friction pads arranged between the acting part and the reaction part of the caliper clamp the brake disc, which rotates together with the wheel, to perform a braking action. As shown in FIG. 4, a sliding pin is constructed of a sleeve 3 inserted into a mounting hole 2 formed in each mounting boss portion 1 of the caliper, and a bolt 4 inserted into the sleeve 3 with a predetermined gap C. 5, the sliding pin 5 is screwed onto a bracket 6 fixed to the vehicle body, and the caliper mounting boss 1 and the sleeve 3 protruding from the boss 1 are attached.
The outer peripheral surface of the sleeve 3 and the mounting boss part 1 are connected between both ends of the sleeve 3.
The sliding surfaces of the sleeve 3 are covered with dust-proof boots 7 and 8 that protect them, and ventilation holes 11 are formed in the pin boot covering portions 9 and 10 of the sleeve 3, respectively.
There is also one in which both the boot covering parts 9 and 10 are communicated through a gap C in the sleeve 3, and the caliper is moved in the axial direction of the brake disk by the guide of the sleeve 3 around the outer periphery of the sliding pin 5.

[Problem that the invention attempts to solve]

However, in the case of the above structure, since both the bracket and the dust surface of the bolt that the end surfaces of the sleeve come into contact with are metal processed surfaces, moisture can enter the sleeve 3 and cause rust on the bolt, causing the sleeve to There is a risk of clogging the bolt gap.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pin slide type vehicle disc brake that can prevent moisture from entering the sleeve and allow smooth movement of the caliper.

[Means for solving problems]

In order to achieve the above object, the present invention inserts a sliding pin consisting of a sleeve and a bolt inserted into the sleeve with a predetermined gap into the mounting hole formed in the mounting boss portion of the caliper. The mounting boss of the caliper and both ends of the sleeve protruding from the boss are covered with dust-proof pin boots, and the sliding pins are fixed to the vehicle body side bracket so that the caliper moves in the axial direction of the brake disc. In a pin slide type vehicle disc brake for guiding, vent holes are formed in both pin boot covering portions of the sleeve, passing through the outer circumferential side and the inner circumferential side of the sleeve, respectively, and both boot covering portions are connected to both the vent holes and the inner circumferential side of the sleeve. It is characterized in that sealing members are provided at the outer end sides of both vent holes to seal the inside of the sleeve between the sleeve and the bolt and between the sleeve and the bracket, while communicating through a gap.

[Effect]

With this configuration, it is possible to prevent moisture from entering the sleeve.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The caliper 20 has an action part 20a and a reaction part 20b.
and a bridge part 20c connecting them, and the bridge part 20c straddles the disc 21 and friction pads 22, 22 disposed on both sides of the disc 21 so as to be movable in the disc axial direction, and the caliper 2
At mounting bosses 25 and 26 formed at the tips of arms 23 and 24 extending from both wings of the 0, sliding pins 28 and 29 are attached to a bracket 27 fixed to the vehicle body so as to be movable in the disk axial direction. ing.

Then, attach the caliper 20 to the vehicle body side bracket 27.
The sliding pins 28, 29 are movably supported by
Of these, the sliding pin 29 on the right side in FIG.
0 to the bracket 27 in a removable manner, and the sliding pin 29 is inserted into a pin mounting hole 32 formed in the mounting boss 26 at the tip of one arm 24 of the caliper 20. , both ends of which extend and are slidably inserted.

Further, the base end of the sliding pin 29 extending from the mounting boss portion 26 toward the bracket 27 is connected to the bracket 2 of the pin mounting hole 32 of the mounting boss portion 26.
Sleeve 30 of the inner peripheral surface of the mouth edge on the 7 side and the sliding pin 29
The bellows-shaped dustproof boots 33 are fitted and locked at both ends into annular locking grooves formed on the outer peripheral surface of the bracket 37 side ends, and also extend to the opposite side of the sliding pin 29. Both ends of the tip end are inserted into annular locking grooves formed on the inner circumferential surface of the rim of the pin mounting hole 32 on the anti-bracket side and on the outer circumferential surface of the end of the sleeve 30 of the sliding pin 29 on the anti-bracket side. The dust-proof boots 34, which are the same as the dust-proof boots 33 that are fitted and locked, are each airtightly covered to prevent dust from adhering to both extensions of the sliding pin 29. Airtight chambers 35, 36 are formed between the inner surfaces of the sleeves 33, 34 and the outer peripheral surface of the sleeve 30. Drilled ventilation hole 3
7, 37, the fixing bolt 31 inserted through the sleeve 30, and the inner circumferential surface of the sleeve 30 communicate with each other via a gap C.

At the contact portion between the sleeve 30 and the fixing bolt 31, an O-ring 38 is fitted into an annular groove 31b provided around the shaft portion 31a of the fixing bolt 31. On the surface, an O-ring 3 is placed in an annular groove 27a provided around the bracket 27.
9 is fitted, and the shaft portion 31 of the fixing bolt 31
There is also an annular groove 31c at the screwed part with the bracket 27 in a.
is provided around the annular groove 31c, and an O-ring 40 is fitted into the annular groove 31c, thereby sealing the inside of the sleeve 30.

FIG. 3 shows another embodiment of the sealing member disposed inside the seal 30, in which grooves 41 and
42 is provided around the circumference, and an O-ring 43 is provided in the grooves 41 and 42.
are arranged respectively to seal the inside of the sleeve 30.

By configuring as above, the sleeve 3
This prevents moisture from entering the inside of the caliper 20 and does not obstruct the communication of air between the airtight chambers 35 and 36 when the caliper 20 moves in the axial direction of the brake disc 21, allowing the caliper 20 to move smoothly. can be done.

[Effect of idea]

As described above, the present invention involves inserting a sliding pin consisting of a sleeve and a bolt that is inserted into the sleeve with a predetermined gap into the mounting hole formed in the mounting boss portion of the caliper. The caliper mounting boss and both ends of the sleeve protruding from the boss are covered with dustproof pin boots, and the sliding pins are fixed to the vehicle body side bracket to guide the movement of the caliper in the axial direction of the brake disc. In a pin slide type vehicle disc brake, vent holes are formed in both pin boot covering parts of the sleeve, passing through the outer circumferential side and the inner circumferential side of the sleeve. At the same time, a sealing member is provided between the sleeve and the bolt and between the sleeve and the bracket at the outer end of both vent holes to seal the inside of the sleeve, thereby preventing moisture from entering the sleeve. , air communication can be ensured between both boot covering parts, and the caliper can be smoothly moved in the brake disc axial direction. In addition, the pin boot for dustproofing and the seal member that seals the inside of the sleeve are placed independently, so the expansion and contraction of the pin boot does not affect the seal member, resulting in stable sealing performance and reliable communication. Rust prevention of holes can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional plan view showing one embodiment of the disc brake according to the present invention, Fig. 2 is a sectional view of the sliding pin support part, and Fig. 3 is another embodiment of the sliding pin support part. The sectional view shown in FIG. 4 is a sectional view of a sliding pin support portion in a conventional disc brake. 20... Caliper, 21... Brake disc, 25, 26... Mounting boss portion, 27... Bracket, 28, 29... Sliding pin, 30... Sleeve, 31... Fixing bolt, 33, 34... ...Dust-proof boots, 35, 36...Airtight chamber, 37...Vent hole, 38, 39, 40, 43...O-ring.

Claims (1)

[Scope of utility model registration request] In the mounting hole formed in the mounting boss part of the caliper,
A sliding pin consisting of a sleeve and a bolt inserted into the sleeve with a predetermined gap is inserted to prevent dust between the mounting boss of the caliper and both ends of the sleeve protruding from the boss. In a pin slide type vehicle disc brake in which the sliding pin is fixed to a bracket on the vehicle body side and guides the mating movement of the caliper in the axial direction of the brake disc, a sleeve is provided on both pin boots of the sleeve. A ventilation hole is bored through the outer and inner circumference of the sleeve to allow communication between the two boot coverings through both the ventilation holes and the gap in the sleeve. and a pin slide type disc brake for a vehicle, characterized in that a sealing member for sealing the inside of the sleeve is provided between the sleeve and the bracket.